package com.go.ssh.commons.web.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

import com.go.ssh.commons.Constants;

/**
 * 用户设置当前web环境上下文，用于方便如JSP页面使用
 * 
 * @author Administrator
 * 
 */
public class ContextPathFilter implements Filter {
	@Override
	public void init(FilterConfig config) throws ServletException {
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		String contextPath = ((HttpServletRequest) request).getContextPath();
		request.setAttribute(Constants.CONTEXT_PATH, contextPath);
		chain.doFilter(request, response);
	}

	@Override
	public void destroy() {
	}
}
